unknown unknown
unknown unknown · unknown unknowns
An uncertainty of unknown magnitude, consequence, structure, and probability…An uncertainty of unknown magnitude, consequence, structure, and probability characteristics, possibly with completely unsuspected existence; something that we don't know that we don't know.
Meaning
1 sensesAn uncertainty of unknown magnitude, consequence, structure, and probability characteristics, possibly with completely unsuspected existence; something that we don't know that we don't know.
Origin
Popularized by Donald Rumsfeld in 2002, though used much earlier.Popularized by Donald Rumsfeld in 2002, though used much earlier.
Wiktionary, CC BY-SA 4.0 · source
Forms
plural: unknown unknowns| Singular | unknown unknown |
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| Plural | unknown unknowns |
regular